1　前言　　虽然激光加工具有种种优点 ,但在重工业领域应用却受到限制 ,主要原因是 :1 )制品板材比较厚 ;2 )制品形状大 ,而且复杂 ,同类制品量少等。从工序方面来看 ,焊接时要求焊接坡口对合精度高、在焊接质量方面容易产生气孔 ,切割时不可避免地会增大厚板切口的宽度等。对 1 Preface Although laser processing has all the advantages, but its application in the heavy industry has been limited, the main reasons are: 1) product plate is relatively thick; 2) the shape of the product, and complex, less the amount of similar products. From the process point of view, the welding requirements of the welding groove on the high precision, easy to produce porosity in the welding quality, cutting will inevitably increase the width of the slab cut. Correct